Sounds like a heat sheild vibrate

Ok on this 02 suzuki vitara 2.0 engine: have this vibration noise or rattle sounds like a heat sheild broken or loose ive check the exhaust all the heat sheilds cant find any loose or broken. When I start the engine and it begains to idle I hear noise sounds like under the valve cover or front of engine. I can by hand reach over and manualy turn up the idle and its when I can hear all that vibration I did change the belt and tenison pulley, idle pulley was ok I turn all pullys by hand and they seem ok didnt feel or hear, noise or roughness